Add Maestro smoke test tooling foundation

[JorgeMucientes]

Description

Adds the local Maestro smoke-test foundation without adding executable app flows yet.

This introduces the runner, fixture seeding/cleanup helper, Android string environment generator, offline P2 coverage checker, local smoke-test documentation, Codex skills for smoke-test operation/repair, the Maestro MCP entry, and gitignore protection for local credentials and generated artifacts.

The runner is designed for local iteration first: lab-store defaults, explicit shared-store mode, no credential echoing, one retry per failed flow, animation restoration, HTML/JUnit reports, and screenshot/video artifact handling.

Stack navigation: next #16197

Test Steps

1. Run .maestro/scripts/generate-strings-env.py --check-flow-references.
2. Run set -u; source .maestro/strings.env.
3. Run bash -n .maestro/scripts/run-smoke-tests.sh.
4. Open .maestro/docs/index.html and confirm the local smoke-test guide renders.

Images/gif

N/A

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

[dangermattic]

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⚠️	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Build Number	766
	Version	25.1-rc-1
	Application ID	com.woocommerce.android.prealpha
	Commit	3a95c34
	Installation URL	73l66rd67jvf8

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

Version 25.2 has now entered code-freeze, so the milestone of this PR has been updated to 25.3.